Breakpoint 2, 0xb6df17c0 in g_log () from /usr/lib/libglib-2.0.so.0
(gdb)
Continuing.
sys:1: GtkWarning: gtk_widget_get_toplevel: assertion `GTK_IS_WIDGET (widget)' failed

Breakpoint 2, 0xb6df17c0 in g_log () from /usr/lib/libglib-2.0.so.0
(gdb) where
#0  0xb6df17c0 in g_log () from /usr/lib/libglib-2.0.so.0
#1  0xb6df194e in g_return_if_fail_warning () from /usr/lib/libglib-2.0.so.0
#2  0xb75718c2 in ?? () from /usr/lib/libgtk-x11-2.0.so.0
#3  0x00000008 in ?? ()
#4  0xb6e18458 in ?? () from /usr/lib/libglib-2.0.so.0
#5  0xb761dad8 in gtk_text_char_type () from /usr/lib/libgtk-x11-2.0.so.0
#6  0xb7578961 in gtk_combo_string_key () from /usr/lib/libgtk-x11-2.0.so.0
#7  0xb75fe060 in ?? () from /usr/lib/libgtk-x11-2.0.so.0
#8  0x08a24e30 in ?? ()
#9  0xb754b383 in gtk_widget_event () from /usr/lib/libgtk-x11-2.0.so.0
#10 0xb75718c2 in ?? () from /usr/lib/libgtk-x11-2.0.so.0
#11 0xb761dad4 in gtk_text_char_type () from /usr/lib/libgtk-x11-2.0.so.0
#12 0xb7578961 in gtk_combo_string_key () from /usr/lib/libgtk-x11-2.0.so.0
#13 0xb75fe060 in ?? () from /usr/lib/libgtk-x11-2.0.so.0
#14 0x083be274 in ?? ()
#15 0x083be274 in ?? ()
#16 0x08a24e30 in ?? ()
#17 0xb74360b6 in gtk_main_do_event () from /usr/lib/libgtk-x11-2.0.so.0
#18 0x08a24e30 in ?? ()
#19 0x083be274 in ?? ()
#20 0x0815f3e8 in ?? ()
#21 0xb6de4eab in g_list_free_1 () from /usr/lib/libglib-2.0.so.0
#22 0xb6e465fc in ?? () from /usr/lib/libglib-2.0.so.0
---Type <return> to continue, or q <return> to quit---
#23 0x00000000 in ?? ()
#24 0xb6e42180 in ?? () from /usr/lib/libglib-2.0.so.0
#25 0x08a24e30 in ?? ()
#26 0x083bde20 in ?? ()
#27 0x00000000 in ?? ()
#28 0x083be274 in ?? ()
#29 0xb7277c68 in gdk_drawable_get_visible_region ()
   from /usr/lib/libgdk-x11-2.0.so.0
#30 0x08c83d6c in ?? ()
#31 0x08c83d6c in ?? ()
#32 0xb72a6a29 in gdk_event_get_graphics_expose ()
   from /usr/lib/libgdk-x11-2.0.so.0
#33 0xb72e9184 in ?? () from /usr/lib/libgdk-x11-2.0.so.0
#34 0x083be274 in ?? ()
#35 0x0816af30 in ?? ()
#36 0x00000000 in ?? ()
#37 0xb72a6c98 in gdk_event_get_graphics_expose ()
   from /usr/lib/libgdk-x11-2.0.so.0
#38 0x083be274 in ?? ()
#39 0x00000000 in ?? ()
#40 0x0816af78 in ?? ()
#41 0xb6e42180 in ?? () from /usr/lib/libglib-2.0.so.0
#42 0xb72a6c47 in gdk_event_get_graphics_expose ()
---Type <return> to continue, or q <return> to quit---
   from /usr/lib/libgdk-x11-2.0.so.0
#43 0xb6e42180 in ?? () from /usr/lib/libglib-2.0.so.0
#44 0xb6e93100 in __pthread_mutex_unlock_usercnt ()
   from /lib/tls/libpthread.so.0
#45 0x0816af30 in ?? ()
#46 0x00000000 in ?? ()
#47 0x00000000 in ?? ()
#48 0xb6e42180 in ?? () from /usr/lib/libglib-2.0.so.0
#49 0x00000000 in ?? ()
#50 0x085bc020 in ?? ()
#51 0x0816af78 in ?? ()
#52 0xb6dea89c in g_main_context_check () from /usr/lib/libglib-2.0.so.0
#53 0x00000000 in ?? ()
(gdb)